src/librustdoc/json/conversions.rs

   1 //! These from impls are used to create the JSON types which get serialized. They're very close to
   2 //! the `clean` types but with some fields removed or stringified to simplify the output and not
   3 //! expose unstable compiler internals.
   4
   5 #![allow(rustc::default_hash_types)]
   6
   7 use std::convert::From;
   8 use std::fmt;
   9
  10 use rustc_ast::ast;
  11 use rustc_hir::{def::CtorKind, def_id::DefId};
  12 use rustc_middle::ty::{self, TyCtxt};
  13 use rustc_span::def_id::CRATE_DEF_INDEX;
  14 use rustc_span::Pos;
  15 use rustc_target::spec::abi::Abi as RustcAbi;
  16
  17 use rustdoc_json_types::*;
  18
  19 use crate::clean::utils::print_const_expr;
  20 use crate::clean::{self, ItemId};
  21 use crate::formats::item_type::ItemType;
  22 use crate::json::JsonRenderer;
  23
  24 impl JsonRenderer<'_> {
  25     pub(super) fn convert_item(&self, item: clean::Item) -> Option<Item> {
  26         let deprecation = item.deprecation(self.tcx);
  27         let links = self
  28             .cache
  29             .intra_doc_links
  30             .get(&item.def_id)
  31             .into_iter()
  32             .flatten()
  33             .map(|clean::ItemLink { link, did, .. }| (link.clone(), from_item_id((*did).into())))
  34             .collect();
  35         let docs = item.attrs.collapsed_doc_value();
  36         let attrs = item
  37             .attrs
  38             .other_attrs
  39             .iter()
  40             .map(rustc_ast_pretty::pprust::attribute_to_string)
  41             .collect();
  42         let span = item.span(self.tcx);
  43         let clean::Item { name, attrs: _, kind: _, visibility, def_id, cfg: _ } = item;
  44         let inner = match *item.kind {
  45             clean::StrippedItem(_) => return None,
  46             _ => from_clean_item(item, self.tcx),
  47         };
  48         Some(Item {
  49             id: from_item_id(def_id),
  50             crate_id: def_id.krate().as_u32(),
  51             name: name.map(|sym| sym.to_string()),
  52             span: self.convert_span(span),
  53             visibility: self.convert_visibility(visibility),
  54             docs,
  55             attrs,
  56             deprecation: deprecation.map(from_deprecation),
  57             inner,
  58             links,
  59         })
  60     }
  61
  62     fn convert_span(&self, span: clean::Span) -> Option<Span> {
  63         match span.filename(self.sess()) {
  64             rustc_span::FileName::Real(name) => {
  65                 if let Some(local_path) = name.into_local_path() {
  66                     let hi = span.hi(self.sess());
  67                     let lo = span.lo(self.sess());
  68                     Some(Span {
  69                         filename: local_path,
  70                         begin: (lo.line, lo.col.to_usize()),
  71                         end: (hi.line, hi.col.to_usize()),
  72                     })
  73                 } else {
  74                     None
  75                 }
  76             }
  77             _ => None,
  78         }
  79     }
  80
  81     fn convert_visibility(&self, v: clean::Visibility) -> Visibility {
  82         use clean::Visibility::*;
  83         match v {
  84             Public => Visibility::Public,
  85             Inherited => Visibility::Default,
  86             Restricted(did) if did.index == CRATE_DEF_INDEX => Visibility::Crate,
  87             Restricted(did) => Visibility::Restricted {
  88                 parent: from_item_id(did.into()),
  89                 path: self.tcx.def_path(did).to_string_no_crate_verbose(),
  90             },
  91         }
  92     }
  93 }
  94
  95 crate trait FromWithTcx<T> {
  96     fn from_tcx(f: T, tcx: TyCtxt<'_>) -> Self;
  97 }
  98
  99 crate trait IntoWithTcx<T> {
 100     fn into_tcx(self, tcx: TyCtxt<'_>) -> T;
 101 }
 102
 103 impl<T, U> IntoWithTcx<U> for T
 104 where
 105     U: FromWithTcx<T>,
 106 {
 107     fn into_tcx(self, tcx: TyCtxt<'_>) -> U {
 108         U::from_tcx(self, tcx)
 109     }
 110 }
 111
 112 crate fn from_deprecation(deprecation: rustc_attr::Deprecation) -> Deprecation {
 113     #[rustfmt::skip]
 114     let rustc_attr::Deprecation { since, note, is_since_rustc_version: _, suggestion: _ } = deprecation;
 115     Deprecation { since: since.map(|s| s.to_string()), note: note.map(|s| s.to_string()) }
 116 }
 117
 118 impl FromWithTcx<clean::GenericArgs> for GenericArgs {
 119     fn from_tcx(args: clean::GenericArgs, tcx: TyCtxt<'_>) -> Self {
 120         use clean::GenericArgs::*;
 121         match args {
 122             AngleBracketed { args, bindings } => GenericArgs::AngleBracketed {
 123                 args: args.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 124                 bindings: bindings.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 125             },
 126             Parenthesized { inputs, output } => GenericArgs::Parenthesized {
 127                 inputs: inputs.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 128                 output: output.map(|a| (*a).into_tcx(tcx)),
 129             },
 130         }
 131     }
 132 }
 133
 134 impl FromWithTcx<clean::GenericArg> for GenericArg {
 135     fn from_tcx(arg: clean::GenericArg, tcx: TyCtxt<'_>) -> Self {
 136         use clean::GenericArg::*;
 137         match arg {
 138             Lifetime(l) => GenericArg::Lifetime(l.0.to_string()),
 139             Type(t) => GenericArg::Type(t.into_tcx(tcx)),
 140             Const(box c) => GenericArg::Const(c.into_tcx(tcx)),
 141             Infer => GenericArg::Infer,
 142         }
 143     }
 144 }
 145
 146 impl FromWithTcx<clean::Constant> for Constant {
 147     fn from_tcx(constant: clean::Constant, tcx: TyCtxt<'_>) -> Self {
 148         let expr = constant.expr(tcx);
 149         let value = constant.value(tcx);
 150         let is_literal = constant.is_literal(tcx);
 151         Constant { type_: constant.type_.into_tcx(tcx), expr, value, is_literal }
 152     }
 153 }
 154
 155 impl FromWithTcx<clean::TypeBinding> for TypeBinding {
 156     fn from_tcx(binding: clean::TypeBinding, tcx: TyCtxt<'_>) -> Self {
 157         TypeBinding {
 158             name: binding.assoc.name.to_string(),
 159             args: binding.assoc.args.into_tcx(tcx),
 160             binding: binding.kind.into_tcx(tcx),
 161         }
 162     }
 163 }
 164
 165 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 166     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 167         use clean::TypeBindingKind::*;
 168         match kind {
 169             Equality { term } => TypeBindingKind::Equality(term.into_tcx(tcx)),
 170             Constraint { bounds } => {
 171                 TypeBindingKind::Constraint(bounds.into_iter().map(|a| a.into_tcx(tcx)).collect())
 172             }
 173         }
 174     }
 175 }
 176
 177 crate fn from_item_id(did: ItemId) -> Id {
 178     struct DisplayDefId(DefId);
 179
 180     impl fmt::Display for DisplayDefId {
 181         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 182             write!(f, "{}:{}", self.0.krate.as_u32(), u32::from(self.0.index))
 183         }
 184     }
 185
 186     match did {
 187         ItemId::DefId(did) => Id(format!("{}", DisplayDefId(did))),
 188         ItemId::Blanket { for_, impl_id } => {
 189             Id(format!("b:{}-{}", DisplayDefId(impl_id), DisplayDefId(for_)))
 190         }
 191         ItemId::Auto { for_, trait_ } => {
 192             Id(format!("a:{}-{}", DisplayDefId(trait_), DisplayDefId(for_)))
 193         }
 194         ItemId::Primitive(ty, krate) => Id(format!("p:{}:{}", krate.as_u32(), ty.as_sym())),
 195     }
 196 }
 197
 198 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 199     use clean::ItemKind::*;
 200     let name = item.name;
 201     let is_crate = item.is_crate();
 202     let header = item.fn_header(tcx);
 203
 204     match *item.kind {
 205         ModuleItem(m) => ItemEnum::Module(Module { is_crate, items: ids(m.items) }),
 206         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 207         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 208         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 209         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 210         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 211         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 212         FunctionItem(f) => ItemEnum::Function(from_function(f, header.unwrap(), tcx)),
 213         ForeignFunctionItem(f) => ItemEnum::Function(from_function(f, header.unwrap(), tcx)),
 214         TraitItem(t) => ItemEnum::Trait(t.into_tcx(tcx)),
 215         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 216         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, header.unwrap(), tcx)),
 217         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, header.unwrap(), tcx)),
 218         ImplItem(i) => ItemEnum::Impl(i.into_tcx(tcx)),
 219         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 220         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 221         ForeignTypeItem => ItemEnum::ForeignType,
 222         TypedefItem(t) => ItemEnum::Typedef(t.into_tcx(tcx)),
 223         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 224         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 225         MacroItem(m) => ItemEnum::Macro(m.source),
 226         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 227         PrimitiveItem(p) => ItemEnum::PrimitiveType(p.as_sym().to_string()),
 228         TyAssocConstItem(ty) => ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: None },
 229         AssocConstItem(ty, default) => {
 230             ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: Some(default.expr(tcx)) }
 231         }
 232         TyAssocTypeItem(g, b) => ItemEnum::AssocType {
 233             generics: (*g).into_tcx(tcx),
 234             bounds: b.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 235             default: None,
 236         },
 237         // FIXME: do not map to Typedef but to a custom variant
 238         AssocTypeItem(t, _) => ItemEnum::Typedef(t.into_tcx(tcx)),
 239         // `convert_item` early returns `None` for striped items
 240         StrippedItem(_) => unreachable!(),
 241         KeywordItem(_) => {
 242             panic!("{:?} is not supported for JSON output", item)
 243         }
 244         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 245             name: name.as_ref().unwrap().to_string(),
 246             rename: src.map(|x| x.to_string()),
 247         },
 248     }
 249 }
 250
 251 impl FromWithTcx<clean::Struct> for Struct {
 252     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 253         let clean::Struct { struct_type, generics, fields, fields_stripped } = struct_;
 254         Struct {
 255             struct_type: from_ctor_kind(struct_type),
 256             generics: generics.into_tcx(tcx),
 257             fields_stripped,
 258             fields: ids(fields),
 259             impls: Vec::new(), // Added in JsonRenderer::item
 260         }
 261     }
 262 }
 263
 264 impl FromWithTcx<clean::Union> for Union {
 265     fn from_tcx(struct_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 266         let clean::Union { generics, fields, fields_stripped } = struct_;
 267         Union {
 268             generics: generics.into_tcx(tcx),
 269             fields_stripped,
 270             fields: ids(fields),
 271             impls: Vec::new(), // Added in JsonRenderer::item
 272         }
 273     }
 274 }
 275
 276 crate fn from_ctor_kind(struct_type: CtorKind) -> StructType {
 277     match struct_type {
 278         CtorKind::Fictive => StructType::Plain,
 279         CtorKind::Fn => StructType::Tuple,
 280         CtorKind::Const => StructType::Unit,
 281     }
 282 }
 283
 284 crate fn from_fn_header(header: &rustc_hir::FnHeader) -> Header {
 285     Header {
 286         async_: header.is_async(),
 287         const_: header.is_const(),
 288         unsafe_: header.is_unsafe(),
 289         abi: convert_abi(header.abi),
 290     }
 291 }
 292
 293 fn convert_abi(a: RustcAbi) -> Abi {
 294     match a {
 295         RustcAbi::Rust => Abi::Rust,
 296         RustcAbi::C { unwind } => Abi::C { unwind },
 297         RustcAbi::Cdecl { unwind } => Abi::Cdecl { unwind },
 298         RustcAbi::Stdcall { unwind } => Abi::Stdcall { unwind },
 299         RustcAbi::Fastcall { unwind } => Abi::Fastcall { unwind },
 300         RustcAbi::Aapcs { unwind } => Abi::Aapcs { unwind },
 301         RustcAbi::Win64 { unwind } => Abi::Win64 { unwind },
 302         RustcAbi::SysV64 { unwind } => Abi::SysV64 { unwind },
 303         RustcAbi::System { unwind } => Abi::System { unwind },
 304         _ => Abi::Other(a.to_string()),
 305     }
 306 }
 307
 308 impl FromWithTcx<clean::Generics> for Generics {
 309     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 310         Generics {
 311             params: generics.params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 312             where_predicates: generics
 313                 .where_predicates
 314                 .into_iter()
 315                 .map(|x| x.into_tcx(tcx))
 316                 .collect(),
 317         }
 318     }
 319 }
 320
 321 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 322     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 323         GenericParamDef {
 324             name: generic_param.name.to_string(),
 325             kind: generic_param.kind.into_tcx(tcx),
 326         }
 327     }
 328 }
 329
 330 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 331     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 332         use clean::GenericParamDefKind::*;
 333         match kind {
 334             Lifetime { outlives } => GenericParamDefKind::Lifetime {
 335                 outlives: outlives.into_iter().map(|lt| lt.0.to_string()).collect(),
 336             },
 337             Type { did: _, bounds, default, synthetic } => GenericParamDefKind::Type {
 338                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 339                 default: default.map(|x| (*x).into_tcx(tcx)),
 340                 synthetic,
 341             },
 342             Const { did: _, ty, default } => GenericParamDefKind::Const {
 343                 type_: (*ty).into_tcx(tcx),
 344                 default: default.map(|x| *x),
 345             },
 346         }
 347     }
 348 }
 349
 350 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 351     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 352         use clean::WherePredicate::*;
 353         match predicate {
 354             BoundPredicate { ty, bounds, .. } => WherePredicate::BoundPredicate {
 355                 type_: ty.into_tcx(tcx),
 356                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 357                 // FIXME: add `bound_params` to rustdoc-json-params?
 358             },
 359             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 360                 lifetime: lifetime.0.to_string(),
 361                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 362             },
 363             EqPredicate { lhs, rhs } => {
 364                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 365             }
 366         }
 367     }
 368 }
 369
 370 impl FromWithTcx<clean::GenericBound> for GenericBound {
 371     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 372         use clean::GenericBound::*;
 373         match bound {
 374             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 375                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 376                 let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
 377                 GenericBound::TraitBound {
 378                     trait_,
 379                     generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 380                     modifier: from_trait_bound_modifier(modifier),
 381                 }
 382             }
 383             Outlives(lifetime) => GenericBound::Outlives(lifetime.0.to_string()),
 384         }
 385     }
 386 }
 387
 388 crate fn from_trait_bound_modifier(modifier: rustc_hir::TraitBoundModifier) -> TraitBoundModifier {
 389     use rustc_hir::TraitBoundModifier::*;
 390     match modifier {
 391         None => TraitBoundModifier::None,
 392         Maybe => TraitBoundModifier::Maybe,
 393         MaybeConst => TraitBoundModifier::MaybeConst,
 394     }
 395 }
 396
 397 impl FromWithTcx<clean::Type> for Type {
 398     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 399         use clean::Type::{
 400             Array, BareFunction, BorrowedRef, DynTrait, Generic, ImplTrait, Infer, Primitive,
 401             QPath, RawPointer, Slice, Tuple,
 402         };
 403
 404         match ty {
 405             clean::Type::Path { path } => Type::ResolvedPath {
 406                 name: path.whole_name(),
 407                 id: from_item_id(path.def_id().into()),
 408                 args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 409                 param_names: Vec::new(),
 410             },
 411             DynTrait(mut bounds, lt) => {
 412                 let first_trait = bounds.remove(0).trait_;
 413
 414                 Type::ResolvedPath {
 415                     name: first_trait.whole_name(),
 416                     id: from_item_id(first_trait.def_id().into()),
 417                     args: first_trait
 418                         .segments
 419                         .last()
 420                         .map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 421                     param_names: bounds
 422                         .into_iter()
 423                         .map(|t| {
 424                             clean::GenericBound::TraitBound(t, rustc_hir::TraitBoundModifier::None)
 425                         })
 426                         .chain(lt.map(clean::GenericBound::Outlives))
 427                         .map(|bound| bound.into_tcx(tcx))
 428                         .collect(),
 429                 }
 430             }
 431             Generic(s) => Type::Generic(s.to_string()),
 432             Primitive(p) => Type::Primitive(p.as_sym().to_string()),
 433             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 434             Tuple(t) => Type::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 435             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 436             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 437             ImplTrait(g) => Type::ImplTrait(g.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 438             Infer => Type::Infer,
 439             RawPointer(mutability, type_) => Type::RawPointer {
 440                 mutable: mutability == ast::Mutability::Mut,
 441                 type_: Box::new((*type_).into_tcx(tcx)),
 442             },
 443             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 444                 lifetime: lifetime.map(|l| l.0.to_string()),
 445                 mutable: mutability == ast::Mutability::Mut,
 446                 type_: Box::new((*type_).into_tcx(tcx)),
 447             },
 448             QPath { assoc, self_type, trait_, .. } => {
 449                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 450                 let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
 451                 Type::QualifiedPath {
 452                     name: assoc.name.to_string(),
 453                     args: Box::new(assoc.args.clone().into_tcx(tcx)),
 454                     self_type: Box::new((*self_type).into_tcx(tcx)),
 455                     trait_: Box::new(trait_),
 456                 }
 457             }
 458         }
 459     }
 460 }
 461
 462 impl FromWithTcx<clean::Term> for Term {
 463     fn from_tcx(term: clean::Term, tcx: TyCtxt<'_>) -> Term {
 464         match term {
 465             clean::Term::Type(ty) => Term::Type(FromWithTcx::from_tcx(ty, tcx)),
 466             clean::Term::Constant(c) => Term::Constant(FromWithTcx::from_tcx(c, tcx)),
 467         }
 468     }
 469 }
 470
 471 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 472     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 473         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 474         FunctionPointer {
 475             header: Header {
 476                 unsafe_: matches!(unsafety, rustc_hir::Unsafety::Unsafe),
 477                 const_: false,
 478                 async_: false,
 479                 abi: convert_abi(abi),
 480             },
 481             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 482             decl: decl.into_tcx(tcx),
 483         }
 484     }
 485 }
 486
 487 impl FromWithTcx<clean::FnDecl> for FnDecl {
 488     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 489         let clean::FnDecl { inputs, output, c_variadic } = decl;
 490         FnDecl {
 491             inputs: inputs
 492                 .values
 493                 .into_iter()
 494                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 495                 .collect(),
 496             output: match output {
 497                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 498                 clean::FnRetTy::DefaultReturn => None,
 499             },
 500             c_variadic,
 501         }
 502     }
 503 }
 504
 505 impl FromWithTcx<clean::Trait> for Trait {
 506     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 507         let clean::Trait { unsafety, items, generics, bounds, is_auto } = trait_;
 508         Trait {
 509             is_auto,
 510             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 511             items: ids(items),
 512             generics: generics.into_tcx(tcx),
 513             bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 514             implementations: Vec::new(), // Added in JsonRenderer::item
 515         }
 516     }
 517 }
 518
 519 impl FromWithTcx<clean::Impl> for Impl {
 520     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 521         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 522         let clean::Impl { unsafety, generics, trait_, for_, items, polarity, kind } = impl_;
 523         // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 524         let trait_ = trait_.map(|path| clean::Type::Path { path }.into_tcx(tcx));
 525         // FIXME: use something like ImplKind in JSON?
 526         let (synthetic, blanket_impl) = match kind {
 527             clean::ImplKind::Normal => (false, None),
 528             clean::ImplKind::Auto => (true, None),
 529             clean::ImplKind::Blanket(ty) => (false, Some(*ty)),
 530         };
 531         let negative_polarity = match polarity {
 532             ty::ImplPolarity::Positive | ty::ImplPolarity::Reservation => false,
 533             ty::ImplPolarity::Negative => true,
 534         };
 535         Impl {
 536             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 537             generics: generics.into_tcx(tcx),
 538             provided_trait_methods: provided_trait_methods
 539                 .into_iter()
 540                 .map(|x| x.to_string())
 541                 .collect(),
 542             trait_,
 543             for_: for_.into_tcx(tcx),
 544             items: ids(items),
 545             negative: negative_polarity,
 546             synthetic,
 547             blanket_impl: blanket_impl.map(|x| x.into_tcx(tcx)),
 548         }
 549     }
 550 }
 551
 552 crate fn from_function(
 553     function: clean::Function,
 554     header: rustc_hir::FnHeader,
 555     tcx: TyCtxt<'_>,
 556 ) -> Function {
 557     let clean::Function { decl, generics } = function;
 558     Function {
 559         decl: decl.into_tcx(tcx),
 560         generics: generics.into_tcx(tcx),
 561         header: from_fn_header(&header),
 562     }
 563 }
 564
 565 crate fn from_function_method(
 566     function: clean::Function,
 567     has_body: bool,
 568     header: rustc_hir::FnHeader,
 569     tcx: TyCtxt<'_>,
 570 ) -> Method {
 571     let clean::Function { decl, generics } = function;
 572     Method {
 573         decl: decl.into_tcx(tcx),
 574         generics: generics.into_tcx(tcx),
 575         header: from_fn_header(&header),
 576         has_body,
 577     }
 578 }
 579
 580 impl FromWithTcx<clean::Enum> for Enum {
 581     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 582         let clean::Enum { variants, generics, variants_stripped } = enum_;
 583         Enum {
 584             generics: generics.into_tcx(tcx),
 585             variants_stripped,
 586             variants: ids(variants),
 587             impls: Vec::new(), // Added in JsonRenderer::item
 588         }
 589     }
 590 }
 591
 592 impl FromWithTcx<clean::VariantStruct> for Struct {
 593     fn from_tcx(struct_: clean::VariantStruct, _tcx: TyCtxt<'_>) -> Self {
 594         let clean::VariantStruct { struct_type, fields, fields_stripped } = struct_;
 595         Struct {
 596             struct_type: from_ctor_kind(struct_type),
 597             generics: Default::default(),
 598             fields_stripped,
 599             fields: ids(fields),
 600             impls: Vec::new(),
 601         }
 602     }
 603 }
 604
 605 impl FromWithTcx<clean::Variant> for Variant {
 606     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 607         use clean::Variant::*;
 608         match variant {
 609             CLike => Variant::Plain,
 610             Tuple(fields) => Variant::Tuple(
 611                 fields
 612                     .into_iter()
 613                     .map(|f| {
 614                         if let clean::StructFieldItem(ty) = *f.kind {
 615                             ty.into_tcx(tcx)
 616                         } else {
 617                             unreachable!()
 618                         }
 619                     })
 620                     .collect(),
 621             ),
 622             Struct(s) => Variant::Struct(ids(s.fields)),
 623         }
 624     }
 625 }
 626
 627 impl FromWithTcx<clean::Import> for Import {
 628     fn from_tcx(import: clean::Import, _tcx: TyCtxt<'_>) -> Self {
 629         use clean::ImportKind::*;
 630         match import.kind {
 631             Simple(s) => Import {
 632                 source: import.source.path.whole_name(),
 633                 name: s.to_string(),
 634                 id: import.source.did.map(ItemId::from).map(from_item_id),
 635                 glob: false,
 636             },
 637             Glob => Import {
 638                 source: import.source.path.whole_name(),
 639                 name: import.source.path.last().to_string(),
 640                 id: import.source.did.map(ItemId::from).map(from_item_id),
 641                 glob: true,
 642             },
 643         }
 644     }
 645 }
 646
 647 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 648     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 649         ProcMacro {
 650             kind: from_macro_kind(mac.kind),
 651             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 652         }
 653     }
 654 }
 655
 656 crate fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 657     use rustc_span::hygiene::MacroKind::*;
 658     match kind {
 659         Bang => MacroKind::Bang,
 660         Attr => MacroKind::Attr,
 661         Derive => MacroKind::Derive,
 662     }
 663 }
 664
 665 impl FromWithTcx<clean::Typedef> for Typedef {
 666     fn from_tcx(typedef: clean::Typedef, tcx: TyCtxt<'_>) -> Self {
 667         let clean::Typedef { type_, generics, item_type: _ } = typedef;
 668         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 669     }
 670 }
 671
 672 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 673     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 674         OpaqueTy {
 675             bounds: opaque.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 676             generics: opaque.generics.into_tcx(tcx),
 677         }
 678     }
 679 }
 680
 681 impl FromWithTcx<clean::Static> for Static {
 682     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 683         Static {
 684             type_: stat.type_.into_tcx(tcx),
 685             mutable: stat.mutability == ast::Mutability::Mut,
 686             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 687         }
 688     }
 689 }
 690
 691 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 692     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 693         TraitAlias {
 694             generics: alias.generics.into_tcx(tcx),
 695             params: alias.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 696         }
 697     }
 698 }
 699
 700 impl FromWithTcx<ItemType> for ItemKind {
 701     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 702         use ItemType::*;
 703         match kind {
 704             Module => ItemKind::Module,
 705             ExternCrate => ItemKind::ExternCrate,
 706             Import => ItemKind::Import,
 707             Struct => ItemKind::Struct,
 708             Union => ItemKind::Union,
 709             Enum => ItemKind::Enum,
 710             Function => ItemKind::Function,
 711             Typedef => ItemKind::Typedef,
 712             OpaqueTy => ItemKind::OpaqueTy,
 713             Static => ItemKind::Static,
 714             Constant => ItemKind::Constant,
 715             Trait => ItemKind::Trait,
 716             Impl => ItemKind::Impl,
 717             TyMethod | Method => ItemKind::Method,
 718             StructField => ItemKind::StructField,
 719             Variant => ItemKind::Variant,
 720             Macro => ItemKind::Macro,
 721             Primitive => ItemKind::Primitive,
 722             AssocConst => ItemKind::AssocConst,
 723             AssocType => ItemKind::AssocType,
 724             ForeignType => ItemKind::ForeignType,
 725             Keyword => ItemKind::Keyword,
 726             TraitAlias => ItemKind::TraitAlias,
 727             ProcAttribute => ItemKind::ProcAttribute,
 728             ProcDerive => ItemKind::ProcDerive,
 729             Generic => unreachable!(),
 730         }
 731     }
 732 }
 733
 734 fn ids(items: impl IntoIterator<Item = clean::Item>) -> Vec<Id> {
 735     items.into_iter().filter(|x| !x.is_stripped()).map(|i| from_item_id(i.def_id)).collect()
 736 }